Correct Option (C)
The correct sequence of hills from north to south is Nallamalai Hills, Javadi Hills, Nilgiri Hills, and Anamalai Hills.
Nallamalai Hills are part of the Eastern Ghats, primarily located in Andhra Pradesh, representing the northernmost range among the given options.
Javadi Hills are situated in the northern part of Tamil Nadu, lying to the south of the Nallamalai range.
Nilgiri Hills are located at the tri-junction of Tamil Nadu, Kerala, and Karnataka, forming a significant part of the Western Ghats and positioned south of the Javadi Hills.
Anamalai Hills, forming part of the Southern Western Ghats, are found in Kerala and Tamil Nadu, lying to the south of the Nilgiri Hills.
This sequence accurately reflects their latitudinal arrangement from north to south.
Incorrect Options:
Options A, B, and D present an incorrect geographical sequence of the hills from north to south. For instance, Option A incorrectly places Javadi Hills after Nilgiri Hills, while Options B and D incorrectly place Anamalai Hills as the northernmost and Nallamalai Hills as the southernmost. The primary reason for their incorrectness is the erroneous placement of one or more hill ranges in the specified north-to-south alignment.